/Engine/Plugins/Editor/AssetManagerEditor/Source/AssetManagerEditor/Public/ReferenceViewer/EdGraph_ReferenceViewer.h
Returns a set of unique asset types as UClass*
const [TSet](API\Runtime\Core\Containers\TSet)< [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) > & GetAssetTypes() const